#include <iostream>
#include <vector>
#include <array>
using namespace std;
int main()
{
    double a[4]={1.2, 2.4, 3.6, 4.8};
    for(auto &x : a) x*=0.8;
    for(auto x : a) cout<<x<<endl;

    vector<double> v(4);
    v[0]=1.0/3.0;
    v[1]=1.0/5.0;
    v[2]=1.0/7.0;
    v[3]=1.0/9.0;
    array<double, 4> arr={3.14, 2.0, 63.3, 56.0};
    array<double, 4> arr4=arr;

    return 0;
}